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                <h2 id="区分环境"><a href="#区分环境" class="headerlink" title="区分环境"></a>区分环境</h2><ul>
<li><p>在跟文件目录下创建.env.production</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">NODE_ENV=production</span><br><span class="line"><span class="comment">// 最好使用下面的变量进行判断</span></span><br><span class="line">VUE_APP_DEV=production  </span><br></pre></td></tr></table></figure></li>
<li><p>在package.json中</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="string">&quot;build&quot;</span>: <span class="string">&quot;vue-cli-service build --mode production&quot;</span>,</span><br></pre></td></tr></table></figure>
<h3 id="productionSourceMap"><a href="#productionSourceMap" class="headerlink" title="productionSourceMap"></a>productionSourceMap</h3></li>
<li><p>通过判断是否为生产环境,生产环境下设置为false可提高构建效率</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 是否为生产环境</span></span><br><span class="line"><span class="keyword">const</span> environment = process.env.VUE_APP_DEV === <span class="string">&#x27;production&#x27;</span>;</span><br><span class="line"><span class="built_in">module</span>.exports = &#123;</span><br><span class="line">  <span class="comment">// 是否开启sourcemap,设置为false时可加速生产环境构建</span></span><br><span class="line">  productionSourceMap: environment !== <span class="string">&#x27;production&#x27;</span>,</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h3 id="修复HMR-热更新-失败"><a href="#修复HMR-热更新-失败" class="headerlink" title="修复HMR(热更新)失败"></a>修复HMR(热更新)失败</h3><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">module</span>.exports = &#123;</span><br><span class="line">  chainWebpack: <span class="function"><span class="params">config</span> =&gt;</span> &#123;</span><br><span class="line">  <span class="comment">// 修复HMR</span></span><br><span class="line">  config.resolve.symlinks(<span class="literal">true</span>);</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h3 id="优化效率工具"><a href="#优化效率工具" class="headerlink" title="优化效率工具"></a>优化效率工具</h3></li>
<li><p>编译进度条: progress-bar-webpack-plugin;</p>
</li>
<li><p>可视化分析打包: webpack-bundle-analyzer;</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// npm i progress-bar-webpack-plugin -D</span></span><br><span class="line"><span class="comment">// npm i webpack-bundle-analyzer -D</span></span><br><span class="line"><span class="comment">// 引入编译进度条</span></span><br><span class="line"><span class="keyword">const</span> chalk = <span class="built_in">require</span>(<span class="string">&#x27;chalk&#x27;</span>);</span><br><span class="line"><span class="keyword">const</span> ProgressBarPlugin = <span class="built_in">require</span>(<span class="string">&#x27;progress-bar-webpack-plugin&#x27;</span>);</span><br><span class="line"><span class="built_in">module</span>.exports = &#123;</span><br><span class="line">  configureWebpack: <span class="function"><span class="params">config</span> =&gt;</span> &#123;</span><br><span class="line">    <span class="comment">// 只需要在生产环境下开启</span></span><br><span class="line">    <span class="keyword">if</span> (environment) &#123;</span><br><span class="line">      config.plugins.push(</span><br><span class="line">      <span class="comment">// 打包进度条</span></span><br><span class="line">      <span class="keyword">new</span> ProgressBarPlugin(&#123;</span><br><span class="line">        format: <span class="string">`  :msg [:bar] <span class="subst">$&#123;chalk.green.bold(</span></span></span><br><span class="line"><span class="string"><span class="subst">          <span class="string">&#x27;:percent&#x27;</span></span></span></span><br><span class="line"><span class="string"><span class="subst">        )&#125;</span> (:elapsed s)`</span>,</span><br><span class="line">      &#125;),</span><br><span class="line">      <span class="comment">// 分析打包</span></span><br><span class="line">      <span class="keyword">new</span> BundleAnalyzerPlugin(),</span><br><span class="line">      )</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h3 id="构建时压缩图片"><a href="#构建时压缩图片" class="headerlink" title="构建时压缩图片"></a>构建时压缩图片</h3></li>
<li><p>使用image-webpack-loader(其实提升不大)</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// npm i image-webpack-loader -D 或 cnpm i image-webpack-loader -D</span></span><br><span class="line"><span class="comment">// vue.config.js</span></span><br><span class="line"><span class="built_in">module</span>.exports = &#123;</span><br><span class="line">  chainWebpack: <span class="function"><span class="params">config</span> =&gt;</span> &#123;</span><br><span class="line">    <span class="comment">// 生产环境进行压缩图片处理</span></span><br><span class="line">    <span class="keyword">if</span> (environment) &#123;</span><br><span class="line">      <span class="comment">// 图片压缩处理</span></span><br><span class="line">      <span class="keyword">const</span> imgRule = config.module.rule(<span class="string">&#x27;images&#x27;</span>)</span><br><span class="line">      imgRule</span><br><span class="line">        .test(<span class="regexp">/\.(png|jpe?g|gif|webp)(\?.*)?$/</span>)</span><br><span class="line">        .use(<span class="string">&#x27;image-webpack-loader&#x27;</span>)</span><br><span class="line">        .loader(<span class="string">&#x27;image-webpack-loader&#x27;</span>)</span><br><span class="line">        .options(&#123; <span class="attr">bypassOnDebug</span>: <span class="literal">true</span> &#125;)</span><br><span class="line">        .end()</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h3 id="清除console-log打印和注释"><a href="#清除console-log打印和注释" class="headerlink" title="清除console.log打印和注释"></a>清除console.log打印和注释</h3></li>
<li><p>使用uglifyjs-webpack-plugin</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// npm i uglifyjs-webpack-plugin -D</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// vue.config.js</span></span><br><span class="line"><span class="built_in">module</span>.exports = &#123;</span><br><span class="line">  <span class="comment">// 只需要在生产环境下使用</span></span><br><span class="line">  <span class="keyword">if</span> (environment) &#123;</span><br><span class="line">  <span class="keyword">new</span> UglifyJsPlugin(&#123;</span><br><span class="line">    uglifyOptions: &#123;</span><br><span class="line">      output: &#123;</span><br><span class="line">        comments: <span class="literal">false</span>, <span class="comment">// 去掉注释</span></span><br><span class="line">      &#125;,</span><br><span class="line">      warnings: <span class="literal">false</span>,</span><br><span class="line">      compress: &#123;</span><br><span class="line">        drop_console: <span class="literal">true</span>,</span><br><span class="line">        drop_debugger: <span class="literal">false</span>,</span><br><span class="line">        pure_funcs: [<span class="string">&#x27;console.log&#x27;</span>] <span class="comment">//移除console</span></span><br><span class="line">      &#125;</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;)</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h3 id="组件库按需引入"><a href="#组件库按需引入" class="headerlink" title="组件库按需引入"></a>组件库按需引入</h3></li>
<li><p>在babel.config.js中配置以下代码,或者直接查看ant-design-vue的官方网站</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">module</span>.exports = &#123;</span><br><span class="line"><span class="comment">// antd按需引入</span></span><br><span class="line">plugins: [</span><br><span class="line">  [</span><br><span class="line">    <span class="string">&quot;import&quot;</span>,</span><br><span class="line">    &#123;</span><br><span class="line">      libraryName: <span class="string">&quot;ant-design-vue&quot;</span>,</span><br><span class="line">      libraryDirectory: <span class="string">&quot;es&quot;</span>,</span><br><span class="line">      style: <span class="string">&#x27;css&#x27;</span></span><br><span class="line">    &#125;</span><br><span class="line">  ],</span><br><span class="line">  [</span><br><span class="line">    <span class="string">&quot;component&quot;</span>,</span><br><span class="line">    &#123;</span><br><span class="line">      libraryName: <span class="string">&quot;element-ui&quot;</span>,</span><br><span class="line">      styleLibraryName: <span class="string">&quot;theme-chalk&quot;</span></span><br><span class="line">    &#125;</span><br><span class="line">  ]</span><br><span class="line">]</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></li>
<li><p>在vue.config.js中配置以下代码</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">module</span>.exports = &#123;</span><br><span class="line"><span class="comment">// antd按需引入后,less-loader版本过高无法编译,需要加上这段代码</span></span><br><span class="line">css: &#123;</span><br><span class="line">  sourceMap: <span class="literal">false</span>,</span><br><span class="line">  loaderOptions: &#123;</span><br><span class="line">    less: &#123;</span><br><span class="line">      javascriptEnabled: <span class="literal">true</span>,</span><br><span class="line">    &#125;,</span><br><span class="line">  &#125;,</span><br><span class="line">&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h3 id="开启CDN加速"><a href="#开启CDN加速" class="headerlink" title="开启CDN加速"></a>开启CDN加速</h3></li>
<li><p>放置将某些import的包打包到bundle中,而是运行时(runtime)去外部获取这些扩展依赖</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// vue.config.js</span></span><br><span class="line"><span class="keyword">const</span> cdn = &#123;</span><br><span class="line">  <span class="comment">// cdn的css链接</span></span><br><span class="line">  css: [</span><br><span class="line">    <span class="comment">// &#x27;https://cdn.jsdelivr.net/npm/ant-design-vue@1.7.8/dist/antd.min.css&#x27;,</span></span><br><span class="line">    <span class="comment">// &quot;//unpkg.com/element-ui@2.10.1/lib/theme-chalk/index.css&quot;,</span></span><br><span class="line">    <span class="comment">// videojs</span></span><br><span class="line">    <span class="string">&quot;//unpkg.com/video.js@7.10.2/dist/video-js.min.css&quot;</span>,</span><br><span class="line">  ],</span><br><span class="line">  <span class="comment">// cdn的js链接</span></span><br><span class="line">  js: [</span><br><span class="line">    <span class="comment">// 必须放在第一位,不然会报错</span></span><br><span class="line">    <span class="string">&quot;//unpkg.com/vue@2.6.10/dist/vue.min.js&quot;</span>,</span><br><span class="line">    <span class="string">&quot;//unpkg.com/vue-router@3.0.6/dist/vue-router.min.js&quot;</span>,</span><br><span class="line">    <span class="string">&quot;//unpkg.com/vuex@3.1.1/dist/vuex.min.js&quot;</span>,</span><br><span class="line">    <span class="string">&quot;//unpkg.com/axios@0.19.0/dist/axios.min.js&quot;</span>,</span><br><span class="line">    <span class="comment">// &#x27;https://cdn.jsdelivr.net/npm/ant-design-vue@1.7.8/dist/antd.min.js&#x27;,</span></span><br><span class="line">    <span class="comment">// &quot;//unpkg.com/element-ui@2.10.1/lib/index.js&quot;,</span></span><br><span class="line">    <span class="comment">// lazyload</span></span><br><span class="line">    <span class="string">&quot;//unpkg.com/vue-lazyload/vue-lazyload.js&quot;</span>,</span><br><span class="line">    <span class="comment">// videojs</span></span><br><span class="line">    <span class="string">&quot;//unpkg.com/video.js@7.10.2/dist/video.min.js&quot;</span></span><br><span class="line">  ]</span><br><span class="line">&#125;</span><br><span class="line"><span class="built_in">module</span>.exports = &#123;</span><br><span class="line">  configureWebpack: <span class="function"><span class="params">config</span> =&gt;</span> &#123;</span><br><span class="line">    <span class="keyword">if</span> (environment) &#123;</span><br><span class="line">    <span class="comment">// 配置需要cdn的包</span></span><br><span class="line">    config.externals = &#123;</span><br><span class="line">      vue: <span class="string">&#x27;Vue&#x27;</span>,</span><br><span class="line">      <span class="string">&#x27;vue-router&#x27;</span>: <span class="string">&#x27;VueRouter&#x27;</span>,</span><br><span class="line">      <span class="string">&quot;element-ui&quot;</span>: <span class="string">&quot;ELEMENT&quot;</span>,</span><br><span class="line">      <span class="string">&#x27;ant-design-vue&#x27;</span>: <span class="string">&#x27;antd&#x27;</span>,</span><br><span class="line">      axios: <span class="string">&#x27;axios&#x27;</span>,</span><br><span class="line">      vuex: <span class="string">&#x27;Vuex&#x27;</span>,</span><br><span class="line">      <span class="string">&#x27;vue-lazyload&#x27;</span>: <span class="string">&#x27;VueLazyload&#x27;</span>,</span><br><span class="line">      videojs: <span class="string">&#x27;Videojs&#x27;</span></span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">  &#125;,</span><br><span class="line">  chainWebpack: <span class="function"><span class="params">config</span> =&gt;</span> &#123;</span><br><span class="line">  config.when(process.env.VUE_APP_DEV === <span class="string">&#x27;production&#x27;</span>, <span class="function"><span class="params">config</span> =&gt;</span> &#123;</span><br><span class="line">  <span class="comment">/* 设置打包入口 */</span></span><br><span class="line">  <span class="comment">// config.entry(&#x27;app&#x27;).clear().add(&#x27;./src/main-prod.js&#x27;)</span></span><br><span class="line">    config.plugin(<span class="string">&#x27;html&#x27;</span>).tap(<span class="function"><span class="params">args</span> =&gt;</span> &#123;</span><br><span class="line">      <span class="comment">// html中添加cdn</span></span><br><span class="line">      args[<span class="number">0</span>].cdn = cdn;</span><br><span class="line">      <span class="keyword">return</span> args;</span><br><span class="line">    &#125;)</span><br><span class="line">  &#125;);</span><br><span class="line">  config.when(process.env.VUE_APP_DEV === <span class="string">&#x27;development&#x27;</span>, <span class="function"><span class="params">config</span> =&gt;</span> &#123;</span><br><span class="line">    <span class="comment">// config.entry(&#x27;app&#x27;).clear().add(&#x27;./src/main.js&#x27;)</span></span><br><span class="line">    config.plugin(<span class="string">&#x27;html&#x27;</span>).tap(<span class="function"><span class="params">args</span> =&gt;</span> &#123;</span><br><span class="line">      <span class="comment">//添加参数isProd</span></span><br><span class="line">      args[<span class="number">0</span>].cdn = [];</span><br><span class="line">      <span class="keyword">return</span> args;</span><br><span class="line">    &#125;)</span><br><span class="line">  &#125;);</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></li>
<li><p>在public/index.html中添加以下代码</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!-- 使用CDN的CSS文件 --&gt;</span></span><br><span class="line">&lt;% for (var i in</span><br><span class="line">  htmlWebpackPlugin.options.cdn&amp;&amp;htmlWebpackPlugin.options.cdn.css) &#123; %&gt;</span><br><span class="line">  <span class="tag">&lt;<span class="name">link</span> <span class="attr">href</span>=<span class="string">&quot;&lt;%= htmlWebpackPlugin.options.cdn.css[i] %&gt;&quot;</span> <span class="attr">rel</span>=<span class="string">&quot;preload&quot;</span> <span class="attr">as</span>=<span class="string">&quot;style&quot;</span> /&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">link</span> <span class="attr">href</span>=<span class="string">&quot;&lt;%= htmlWebpackPlugin.options.cdn.css[i] %&gt;&quot;</span> <span class="attr">rel</span>=<span class="string">&quot;stylesheet&quot;</span> /&gt;</span></span><br><span class="line">&lt;% &#125; %&gt;</span><br><span class="line">  <span class="comment">&lt;!-- 使用CDN加速的JS文件，配置在vue.config.js下 --&gt;</span></span><br><span class="line">&lt;% for (var i in</span><br><span class="line">  htmlWebpackPlugin.options.cdn&amp;&amp;htmlWebpackPlugin.options.cdn.js) &#123; %&gt;</span><br><span class="line">  <span class="tag">&lt;<span class="name">script</span> <span class="attr">src</span>=<span class="string">&quot;&lt;%= htmlWebpackPlugin.options.cdn.js[i] %&gt;&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line">&lt;% &#125; %&gt;</span><br></pre></td></tr></table></figure>
<h3 id="开启gizp压缩"><a href="#开启gizp压缩" class="headerlink" title="开启gizp压缩"></a>开启gizp压缩</h3></li>
<li><p>compression-webpack-plugin,对打包体积有很大的缩减,需要配合nginx</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// npm i compression-webpack-plugin -D</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// vue.config.js</span></span><br><span class="line"><span class="built_in">module</span>.exports = &#123;</span><br><span class="line">  <span class="comment">// 在生产环境下开启gzip</span></span><br><span class="line">  <span class="keyword">if</span> (environment) &#123;</span><br><span class="line">    <span class="keyword">new</span> CompressionWebpackPlugin(&#123;</span><br><span class="line">    filename: <span class="string">&quot;[path].gz[query]&quot;</span>,</span><br><span class="line">    algorithm: <span class="string">&quot;gzip&quot;</span>,</span><br><span class="line">    test: <span class="regexp">/\.(js|css|json|txt|html|ico|svg)(\?.*)?$/i</span>,</span><br><span class="line">    threshold: <span class="number">10240</span>,</span><br><span class="line">    minRatio: <span class="number">0.8</span></span><br><span class="line">  &#125;)</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></li>
<li><p>nginx中相关配置</p>
<figure class="highlight text"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"># 开启gzip</span><br><span class="line">gzip on;</span><br><span class="line"></span><br><span class="line"># 启用gzip压缩的最小文件，小于设置值的文件将不会压缩</span><br><span class="line">gzip_min_length 1k;</span><br><span class="line"></span><br><span class="line"># gzip 压缩级别，1-9，数字越大压缩的越好，也越占用CPU时间，后面会有详细说明</span><br><span class="line">gzip_comp_level 5;</span><br><span class="line"></span><br><span class="line"># 进行压缩的文件类型。javascript有多种形式，后面的图片压缩不需要的可以自行删除</span><br><span class="line">gzip_types application/atom+xml application/geo+json application/javascript application/x-javascript application/json application/ld+json application/manifest+json application/rdf+xml application/rss+xml application/xhtml+xml application/xml font/eot font/otf font/ttf image/svg+xml text/css text/javascript text/plain text/xml;</span><br><span class="line"></span><br><span class="line"># 是否在http header中添加Vary: Accept-Encoding，建议开启</span><br><span class="line">gzip_vary on;</span><br><span class="line"></span><br><span class="line"># Nginx作为反向代理的时候启用</span><br><span class="line">gzip_proxied any;</span><br><span class="line"></span><br><span class="line"># 将接收压缩文件的浏览器中排除Internet Explorer 6，因为IE6根本不支持gzip</span><br><span class="line">gzip_disable &quot;msie6&quot;;</span><br><span class="line"></span><br><span class="line"># 设置系统获取几个单位的缓存用于存储gzip的压缩结果数据流。例如 4 4k 代表以4k为单位，按照原始数据大小以4k为单位的4倍申请内存,4 8k 代表以8k为单位，按照原始数据大小以8k为单位的4倍申请内存。如果没有设置，默认值是申请跟原始数据相同大小的内存空间去存储gzip压缩结果。</span><br><span class="line">gzip_buffers 16 8k;</span><br><span class="line"></span><br><span class="line"># 识别http的协议版本。由于早期的一些浏览器或者http客户端，可能不支持gzip自解压，用户就会看到乱码，所以做一些判断还是有必要的。</span><br><span class="line">gzip_http_version 1.1;</span><br><span class="line"></span><br><span class="line"># 设置压缩所需要的缓冲区大小     </span><br><span class="line">gzip_buffers 4 16k;</span><br></pre></td></tr></table></figure>
<!-- ## BOM
</li>
<li><p>窗口大小</p>
<ul>
<li>innerWidth和innerHeight分别返回<code>浏览器窗口中页面视口的宽度和高度</code>(不包含浏览器边框和工具栏)</li>
<li>outerWidth和outerHeight分别返回<code>浏览器窗口自身的宽度和高度</code></li>
<li>document.documentElement.clientWidth和document.documentElement.clientHeight分别返回<code>页面视口的宽度和高度(渲染页面的实际大小)</code></li>
</ul>
</li>
<li><p>视口位置</p>
<ul>
<li>相对于视口滚动距离的属性有两队,返回相等的值: <code>window.pageXoffset/window.scrollX</code>和<code>window.pageYoffset/window.scrollY</code></li>
<li>可以使用<code>scroll()、scrollTO()和scrollBy()</code>方法滚动页面,这三个方法都接收表示相对视口距离的x和y坐标。其中scroll()和scrollTo()表示要滚动到的坐标,scrollBy()表示滚动的距离</li>
<li>也可以传一个对象,写法如下:<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">window</span>.scrollTo(&#123;</span><br><span class="line">  left: <span class="built_in">Number</span>,</span><br><span class="line">  top: <span class="built_in">Number</span>,</span><br><span class="line">  <span class="comment">// 分别表示正常滚动、平滑滚动</span></span><br><span class="line">  behavior: <span class="string">&#x27;auto/smooth&#x27;</span></span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure></li>
</ul>
</li>
<li><p>导航与打开新窗口</p>
<ul>
<li><code>window.open()</code>方法用于导航到指定URL,也可以用于打开新浏览器窗口</li>
<li><code>window.close()</code>方法用于关闭新打开的窗口</li>
<li>检查浏览器是否阻止弹框,通过window.open()的返回值是否为null,然后配合try…catch进行判断<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> blocked = <span class="literal">false</span>;</span><br><span class="line"><span class="keyword">try</span> &#123;</span><br><span class="line">  <span class="keyword">let</span> open =  <span class="built_in">window</span>.open(<span class="string">&#x27;www.baidu.com&#x27;</span>, <span class="string">&#x27;_blank&#x27;</span>);</span><br><span class="line">   <span class="keyword">if</span> (open === <span class="literal">null</span>) &#123;</span><br><span class="line">     blocked = <span class="literal">true</span>;</span><br><span class="line">   &#125;</span><br><span class="line">&#125; <span class="keyword">catch</span>(err) &#123;</span><br><span class="line">  blocked = <span class="literal">true</span>;</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">if</span> (blocked) &#123;</span><br><span class="line">  <span class="comment">// 弹框被阻止!</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></li>
</ul>
</li>
<li><p>setTimeout循环定时器取消</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> num = <span class="number">0</span>;</span><br><span class="line"><span class="comment">// 设置一个最大值</span></span><br><span class="line"><span class="keyword">let</span> max = <span class="number">10</span>;</span><br><span class="line"><span class="comment">// 存放定时器ID</span></span><br><span class="line"><span class="keyword">let</span> timer = <span class="literal">null</span>;</span><br><span class="line"><span class="keyword">let</span> incrementNumber = <span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>&#123;</span><br><span class="line">  num++;</span><br><span class="line">  <span class="comment">// 如果num还没到最大值,再次设置一个超时任务</span></span><br><span class="line">  <span class="keyword">if</span> (num &lt; max) &#123;</span><br><span class="line">    timer = <span class="built_in">setTimeout</span>(incrementNumber, <span class="number">500</span>);</span><br><span class="line">  &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">    <span class="built_in">clearTimeout</span>(timer);</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br><span class="line">timer = <span class="built_in">setTimeout</span>(incrementNumber, <span class="number">500</span>;)</span><br></pre></td></tr></table></figure></li>
<li><p>location对象</p>
<ul>
<li>location提供了当前窗口加载文档的信息,以及通常的导航功能</li>
<li><code>decodeURIComponent()</code>方法用于解码由<code>encodeURIComponent</code>方法或者其它类似方法编码的部分统一<code>资源标识符（URI）</code>。 –&gt;</li>
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